https://techcrunch.com/2018/07/12/apple-partnered-with-black-magic-on-an-external-gpu-for-macbooks/

Apple announced external GPU support at last year’s WWDC, finally rolling out support for the feature back in March. Since then, a handful of manufacturers have brought Thunderbolt 3 functionality to their units, including, notably, Razer back in March.

Alongside the release of new MacBook Pros, the company has taken an extra step toward embracing the tech by giving its seal of approval to a new system from Blackmagic —  the simply named Blackmagic eGPU. The company does these kinds of partnerships from time to time — the LG UltraFine 5K Display being perhaps the most notable example.